CD4 and systemic lupus erythematosus: ScRNA‐seq data of cutaneous lesions revealed that expanded chemokine ligand 20+ keratinocytes, C‐X‐C chemokine ligand 1+ fibroblasts, ISGhigh CD4/CD8 T cells, and ISGhigh plasma cell/pDC/natural killer (NK) subclusters were identified in discoid LE (DLE) and SLE patients, compared with healthy controls (HCs), and higher cell communication scores between some cell types were also observed in DLE and SLE patients [9].